Here is what the World Obesity Organisation says:
The epidemic of obesity is now recognized as one of the most important public health problems facing the world today. Tragically, adult obesity is more common globally than under-nutrition. According to the World Health Organisation (2014) their are around 2 billion adults overweight, of those 670 million are considered to be affected by obesity (BMI ≥30 kg/m²) and 98 million severely affected by obesity (BMI ≥35 kg/m²). If current trends continues it is estimated that 2.7 billion adults will be overweight, over 1 billion affected by obesity and 177 million adults severely affected by obesity by 2025.
We estimate that over 200 million school-age children are overweight, making this generation the first predicted to have a shorter lifespan than their parents.
Source: World Obesity Organisation [online] available at http://www.worldobesity.org/resources/aboutobesity/: accessed on 27/6/2016
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The World Health Organisation (WHO) says that
Worldwide more than 1.9 billion adults are overweight and of these 600 million are obese.
See WHO (2015) )Obesity and Overweight. Available from http://www.who.int/mediacentre/factsheets/fs311/en/ [accessed 10 May 2016]
According to the Centers for Disease Control and Prevention (CDC), the following are health consequences of obesity:
This is not a definitive guide check all the other sources to check it out